Trion 259112-102 Air Purifier Filter, 20" x 25" x 5", Bear Series - MERV 11 Highly-efficient MERV 11 filter, electrostatically-charged synthetic material, provides superior efficiency with minimal added pressure drop Finger supported vertical pleats remain evenly spaced while maximizing dirt holding capacity at the lowest pressure drop Suitable for use with all types of forced- HVAC configurations Factory installed, double gasket, top and bottom, eliminates filter bypass Galvanized rust-resistant wire mesh, integral width filter media, supports media and retains pleats Actual Size: 19.75'' x 24.25'' x 4.94''